A device which controls the voltage and current being delivered to a capacitor or battery.

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2answers
43 views

How to make USB smartphone charger? [duplicate]

I want to make a USB cell phone charger. I know USB operates in 5 volts which means i need to drop down voltage if i have battery potential greater than 5 Volts. I have 12 volts sealed lead acid ...
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0answers
11 views

Help with solar panel/battery & load calculations

First solar project and I've been researching for a couple of days but still struggling with some basics. Trying to set up a simple 12v system, maintained by a solar panel. Solar Panel> Charge ...
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1answer
58 views

Will a diode conduct if one side is floating and one side has voltage applied to it?

I have a circuit that has a battery output voltage of about 7V and can also have a charger input that when plugged in will output around 9V. The battery/charger power a microcontroller (regulated ...
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1answer
48 views

Can I run a 110v battery charger/maintainer off a solar panel?

I have a Batt Cat II battery charger/maintainer hooked up to the batteries on my boat. I keep it at a storage yard that doesn't have 110v outlets available. I was wondering if it is possible or ...
0
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1answer
52 views

pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries.I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel mosfets in an half bridge ...
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2answers
25 views

Output charger indications

its a small question ...i got on my cell charger the indications as follow: input:100-240 V 50-60 Hz output: 5 V DC 1 A.... the question is what does the 1 A mean? i am new to circuits and ...
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0answers
37 views

laptop charger reading 14V and specs says 19.5V [closed]

I have a Laptop charger that reads output 19.5V in the specifications but when I use a multimeter to test voltage, it reads 14V, is this normal? Thank you, Matias.
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31 views

Saftly Fast Charge Capacitors from Mains power 100-250v AC with charged cut off

I have an Capacitive Battery Charger but unsure how safe it would be to charge a Capacitor bank with so far one safety concern is if the Capacitive Battery Charger is not charging anything the ...
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2answers
364 views

What is the purpose of these forks?

I have disassembled a phone charger today and I have found some interesting feature that I do not understand, I have marked it on the picture. Left side of this structure is connected to P1, that is ...
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1answer
82 views

Making a universal USB charger

I would like to make an universal USB charger. I have a 5V, 2A max generator and I can not find any electronic assembly to create a Dedicated Charging Port able to charge Samsung, Apple and other ...
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2answers
50 views

DC-DC & Solar Question

I normally am pretty good with electrics and they taught us about them in a few of my classes, specifically my into to engineering courses. I however don't know a ton about solar panels so this ...
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1answer
51 views

can i use a 20V, 2.0A for my laptop that needs 19V, 4.74 A? [closed]

i have a laptop that needs 19V and 4.74A my laptop's charger broke and i replaced it with a 20V and 2.0 A the laptop seems fine but i noticed that the charging goes on and off for like an interval or ...
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1answer
26 views

18v nimh battery charger [duplicate]

For the 18V +/- NIMH battery pack (2 x 9V packs in series @ 200mAh) that I use to run my phono preamp, I need a simple trickle charge circuit. The LM317 IC seems to be the one that is used a lot. ...
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2answers
46 views

In a power supply, the current is a constant or gives whats the component/circuit need ? [duplicate]

I everybody, sorry for my english :D . i'm a begginer of electronic and i'm learning a lot of electronic component, voltages, current and so on. My question is about a charger (phone charger for ...
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0answers
47 views

Be on the safe side with 12 v battery as powersupply

I have a 12 v battery connected to a LI-PO charger that uses 1.5A. Now i want to make sure i'm not going to fry anything so i want to connect a fuse. Question 1. How do i calculate the value of the ...
0
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1answer
68 views

What's the purpose of this bulky cylindrical part near the plug end of a laptop charger cord? [duplicate]

I want to fix my laptop charger cord, I used a multimeter to check the voltage and it gives me less than one volt. It feels very flexible near the plug, but I don't know if I can cut before or after ...
2
votes
1answer
97 views

How to get 5V 4A from two 5V 2A chargers

I have two 5V 2A chargers. I want to get 5v 4A. Can I connect both in parallel like this?: simulate this circuit – Schematic created using CircuitLab Can I do it? Because in parallel ...
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2answers
48 views

Detecting HI-Z state of charge controller

I have been building a Li-Ion charge controller with MCP73831. The STAT pin has 3 states as shown below: The circuit I come up so far is this: Is there a way to detect the HI-Z state with ...
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1answer
56 views

Variable Current Lead Acid Battery Charging

I'm designing a solar controller in order to charge SLA batteries. I did some research on dedicated ICs that act as controllers, and found that most implement some sort of MPPT, in order to extract ...
0
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0answers
60 views

Can I decrease volts to increase amps

I made a solar USB charger that uses an LM2596S variable voltage regulator to decrease the ≈22V to 5V. It works fine for my older devices but lacks to current to activate the charge mode on my ...
1
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1answer
60 views

Why do laptop batteries and chargers differ in voltage output?

As an example, my laptop's charger gives out 19,5V and 3.42Ah while it's battery gives out 11,1V and 2.2Ah, what's going on exactly?
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1answer
60 views

charging circuit for series coin batteries

I am designing a circuit that will be powered by two rechargable coin cells in series, and I need to include a module to recharge them in-situ. I have had a look on RS at the range of rechargable ...
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1answer
73 views

Solar charging using or not using a dummy (dump) load

I'm in the process of designing a small solar regulator / charger (no more than 5A) for sealed lead acid batteries. I have put a working prototype together and all seems to be working. However, ...
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0answers
29 views

How to rewire a 6-port usb charging hub

For a project in school I am building a product which displays and charges any device which can run from a usb port. The problem is that I have the holes for the usb ports cut out of custom positions ...
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1answer
56 views

Operation of a micro USB phone charger outside its limits

Many micro USB phone chargers give 5V DC and 1500 mA output at input 100-240 V AC at 50-60 Hz (these values are from a Sony EP 880 charger). What happens to the output when voltage rises above 240 and ...
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2answers
79 views

Triac circuit confusion

X1Iz.png I have the following questions about the above circuit: -Why are we even using a trica/diac combo above. Why would a circuit consisting of just the fuse, switch and primary not be ...
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1answer
141 views

Looking for circuit diagrams of current mobile phone chargers [closed]

I am writing an investigation into how a mobile phone charger works and I'm required to break down the internals with a block diagram with component explanations. To help get me on track I'm looking ...
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0answers
65 views

Solar panel - voltage regulator

I am contemplating the possibility to run a trolling motor (to push my canoe) with a 250W solar panel. Electrical Specifications: Peak power: 250 W (minus 0, plus 5W Tolerance!) Optimum operating ...
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1answer
96 views

Solar Charge Controller Function Details

I am planning to make this controller: I would like to understand the way the components work to switch from charging to dumping and vice versa at set points. Note that the 555 timer is not being ...
1
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1answer
32 views

Will the charging current decrease due to a higher input resistance?

I am trying to design a board with USB powered linear battery charger IC charging a 3.7v Li-ion battery. I am concerning about the the relationship between charging path resistance and the maximum ...
0
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2answers
320 views

What happens if you put the connector of a live charger in your mouth?

So what exactly would happen if you put the connector of a plugged-in charger in your mouth? I am sure it is a bad idea but can it really hurt or even kill you? Some posts on social media led me to ...
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0answers
30 views

Finish of charging

Is it possible to determine the fact charger has finished it's work (accumulator unplugged or charged) by any metrics in AC circuit? History of metrics is also available. Can this be resolved in ...
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2answers
46 views

Possible to charge a phone battery by using built in contacts? [closed]

Recently I had a Plum Coach Plus II handed down to me because a family member broke the charger port on the device. I managed to charge it after a few minutes of propping and plugging in the cable ...
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3answers
616 views

How to autoregulate a TP4056 for maximum solar power extraction

I'm using a solar panel (6V - 600mA at peak power) to charge a Li-Ion (3.7V) battery using a TP4065. The TP4065 I'm using has this configuration: Where the value of the resistor Rprog determines ...
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0answers
29 views

Creating a switch between USB and USB OTG for phones [duplicate]

I'm trying to create a charger that knows how to switch between OTG and charging mode. The OTG side is working, and my Samsung S4 goes into charging mode. However, charging is really slow. It even ...
1
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2answers
52 views

Do chargers use power when they're not charging? [duplicate]

1) If I connect my mobile charger to a wall socket and it is switched on, but I don't connect my mobile to the charger, does the charger still use electricity? 2) If I connect an extension box to a ...
2
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1answer
110 views

how can I hack a usb charger to work with ALL phones and specifications

perhaps I am asking for too much. Please do tell. So I have a few usb chargers laying around. I realised that in these chargers I can charge iPhones and I can ...
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1answer
48 views

What is “ol plug-it-in” as a charge approach?

I'm reading an article which is about wearable smart watches. In the following context author says Sony SmartWatch 3 uses ol' plug-it-in approach for charging, I ...
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0answers
255 views

Solar charge controller circuit for LiFePO4 (or possibly NiMH batteries)

Would someone happen to know of a circuit board for charging LiFePO4 batteries from solar panels. Or alternatively a simple circuit schematic for building one? I would like to use 2 LiFePO4 ...
0
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1answer
297 views

Li-ion 3s balancing charging using a TP4056 with protection OR use other charger and a protection

Trying to make a little powerpack for my boat with old 18650 cells. A am planning on a 1 kwh pack, so charging each cell indivually is not an option... I have planned to set up 10 packs of 4 ...
0
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0answers
25 views

Female USB charger in a car [duplicate]

I want to build a charger via USB in my car. I have a female USB but I want to know how to make this. I don't know how USB works for charging. I have also a cigar lighter in my car and a charger. ...
1
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1answer
174 views

Charging li-ion cell using constant-voltage only

Introduction Various resources [1] [2] state that the optimal method of charging a li-ion cell -- such as one found in a mobile phone -- is to charge at a constant current (usually <1C) until a ...
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1answer
113 views

How to Simply Lower Current in Circuit and Maintaining Voltage?

A charger with a transformer is putting out 12.6V and runs at 5A when I plug in the battery as the bat is fairly empty (10V of 12). I would like to limit the current to 2A. I tried a 5ohm 5 watt ...
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0answers
31 views

Grounding A Circuit of a Power Tool Battery Charger to Use as Car Battery Charger [duplicate]

I took a charger that matches what I need to charge a car battery. The charger uses a transformer and has 3 connections, as does the battery it's intended for (+/-/T). When I plug the + and - alone ...
0
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2answers
125 views

Modifying a Simple Transformer Circuit

I have a heavy 14.4V 1.5A heavy battery charger I would like to use to charge my car battery (over time, monitored for heat in a well ventilated area). When I plug the battery to the charger as is, ...
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1answer
162 views

USB charging at 4.3 volts

I'm trying to create a charger that knows how to switch between OTG and charging mode. The OTG side is working, and my Samsung S4 goes into charging mode. However, charging is really slow. It even ...
0
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1answer
69 views

Rewiring a 12V charger

I have a Windows tablet with a charger which crapped out. The old charger was 12V / 1.5A - fairly standard but it had a rare tiny pin connector. Rather than buy a new charger, I decided to cannibalise ...
2
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1answer
314 views

Best Option for Charging a High Voltage Capacitor?

I was looking for a good option to charge my 450V 6800uF Electrolytic Capacitors. I initially followed the dc - dc booster path with a voltage divider comparator (op-amp) something similar to But ...
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0answers
136 views

Smart Battery Charger with BQ24450

I am a newbie and need help in designing a smart battery charger with BQ24550 here are some details mentioned. Battery pack has 4 Lead Acid batteries (Panasonic LC-R064R5P) 6V 4.5Ah connected in ...
0
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0answers
78 views

Plugging battery backup and AC/DC converter into the same battery

Today, I took one of the UPS (UPS A) the battery out and directly plugged it to bigger 12V battery (so if the electricity is out it stays long). And I also have AC/DC 2000Watt inverter. That inverter ...